Yes, I'm currently on the latest developer beta of High Sierra. Changing the theme to a non-blurred theme or disabling the blur on the existing theme does indeed "fix" the problem. If you want, I can try a PRAM reset to see if that makes any difference.
My other Mac, a late 2014 5K iMac with AMD M290X, is still on Sierra but if it helps I'm willing to install the High Sierra beta on a separate disk to see if the issue happens there.